ProjectRootManager.getContentSourceRoots() equivalent for PyCharm/PythonCore

I am developing a plugin to run PyLint directly from PyCharm but I don't know how to get the list of all the Python files in the project.

For Java projects I can simply use

final ProjectRootManager projectRootManager = ProjectRootManager.getInstance(project);
sourceRoots = projectRootManager.getContentSourceRoots()

Is there an equivalent for Python projects?

Also, is there a way to get all the Python files of a specific module?